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Overview

The HTML to JSX converter transforms standard HTML markup into JSX syntax compatible with React and other JSX-based frameworks. Automatically handles attribute name conversions (e.g., class → className), self-closing tags, and JSX-specific syntax requirements.

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Use Cases

  • React Migration: Convert existing HTML templates to React components
  • Component Development: Transform HTML mockups into JSX markup
  • Code Generation: Generate JSX from design tools or HTML exports
  • Learning: Understand differences between HTML and JSX syntax
  • Rapid Prototyping: Quickly convert static HTML to React-ready JSX

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Input Format

Standard HTML markup: 
<div class="container">
  <h1>Hello World</h1>
  <p>This is a paragraph.</p>
  <img src="image.jpg" alt="Description">
</div>

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With Inline Styles

<div style="color: red; font-size: 16px;">
  <p>Styled content</p>
</div>

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With Form Elements

<form>
  <label for="email">Email:</label>
  <input type="email" id="email" name="email">
  <button>Submit</button>
</form>

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Output Format

JSX with React-compatible syntax: 
<div className="container">
  <h1>Hello World</h1>
  <p>This is a paragraph.</p>
  <img src="image.jpg" alt="Description" />
</div>

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Transformations

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Attribute Names

HTMLJSX
classclassName
forhtmlFor
tabindextabIndex
maxlengthmaxLength
readonlyreadOnly
colspancolSpan
rowspanrowSpan
accesskeyaccessKey
contenteditablecontentEditable

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Self-Closing Tags

<!-- HTML -->
<img src="image.jpg">
<br>
<input type="text">

{/* JSX */}
<img src="image.jpg" />
<br />
<input type="text" />

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Inline Styles

<!-- HTML -->
<div style="color: red; font-size: 16px;"></div>

{/* JSX */}
<div style={{color: 'red', fontSize: '16px'}}></div>

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Examples

<div class="card">
  <h2>Card Title</h2>
  <p>Card description text.</p>
  <button class="btn btn-primary">Click Me</button>
</div>

<form action="/submit" method="post">
  <label for="username">Username:</label>
  <input type="text" id="username" name="username" maxlength="20">
  <label for="email">Email:</label>
  <input type="email" id="email" name="email">
  <button type="submit">Submit</button>
</form>

<div style="background-color: #f0f0f0; padding: 20px;">
  <h3 style="color: #333; margin-bottom: 10px;">Styled Header</h3>
  <p style="font-size: 14px; line-height: 1.5;">Styled paragraph.</p>
</div>

<table class="data-table">
  <thead>
    <tr>
      <th colspan="2">Header</th>
    </tr>
  </thead>
  <tbody>
    <tr>
      <td>Cell 1</td>
      <td>Cell 2</td>
    </tr>
  </tbody>
</table>

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Features

  • Attribute Conversion: Automatic transformation of HTML attributes to JSX props
  • Self-Closing Tags: Ensures all void elements use JSX self-closing syntax
  • Style Object Conversion: Transforms inline style strings to JSX style objects
  • Preserved Structure: Maintains document structure and nesting
  • Comment Handling: Converts HTML comments to JSX comment syntax
  • Boolean Attributes: Handles boolean attributes correctly (e.g., disabled, checked)

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Common Issues

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Event Handlers

HTML event attributes are converted but need manual function assignment: 
<!-- Input -->
<button onclick="handleClick()">Click</button>

{/* Output - requires manual function binding */}
<button onClick="handleClick()">Click</button>

{/* Correct usage */}
<button onClick={handleClick}>Click</button>

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Data Attributes

Data attributes remain unchanged: 
<div data-id="123" data-role="admin">Content</div>

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Implementation Details

From lib/tools/engine.ts:652-661: 
case 'html-to-jsx': {
  try {
    const mod = await import('html-to-jsx');
    const htmlToJsx = mod.default || mod;
    if (typeof input !== 'string') throw new Error('Input must be a string');
    return { output: htmlToJsx(String(input)) };
  } catch (e: any) {
    return { output: 'Conversion error: ' + e.message };
  }
}
Uses the html-to-jsx library for comprehensive HTML to JSX transformation. Handles edge cases and JSX-specific requirements automatically.
After conversion, review the output for:
  • Event handlers that need function references
  • Dynamic content that should use JSX expressions {}
  • Component imports and React-specific patterns
The converter transforms syntax but doesn’t create React components. You’ll need to wrap the JSX in a component function and add necessary imports (import React from 'react').

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